An investigation of polyphase machinery from a consideration of magnetic energy
De la Garza, Rodolfo
Master of Science
Statement of Problem: The purpose of this paper is to develop torque formulas for polyphase machinery from a consideration of the energy change in their magnetic fields due to a displacement of the magnetic axes of the component fields. Summary: Generalized formulas are developed which relate the energy and change in energy in a magnetic circuit as a result of a displacement of the magnetic axes of the component fields. These formulas are then successively applied to non-salient pole motors and generators, induction motors and generators, reluctance machines, and salient pole motors and generators. Conclusions: The torque formulas developed do not furnish practical working equations, except in the case of the reluctance motor. However, this method of approach should be valuable for instructional purposes. Firstly, it develops formulas from basic concepts. Secondly, it defines power angle in a generalized equation, which may then be conveniently applied to define a power angle in induction motors, and in reluctance motors.